Self-locking extensible stand or support.



E. LEVIN.

-SELF LOCKING-EXTNSIBLE STAND 0R SUPPORT.

APPLICATIGN FILED MAR. Il, |914. Mmwm Patented. A111220, 1915.

f@ www M/nes'ses lifflFiD TAKE@ EDWARD LEVIN, 0E NEIN YORK, N. Y.

SELF-LOCKING EXTENSIBLE STAND 0R SUPPORT.

meenam Specicaton of Letters Patent.

Patented Apr. 29, 1915.

Application led March 11, 1914. Serial No. 823,853.

To all 'whom it may concern Be 1t known that I, EDWARD LEVIN, a subject of the Czar of Russia, residing at New York city, borough of Brooklyn, county of Kings, State of New York, have invented certain new and useful Improvements in Self-Locking Extensible Stands or Supports, of which the following is a full, clear, and exact description.

This invention relates to an improvement in locking devices for adjustably or slidably connected supports, particularly supports consisting of tubular elements fitted one over the other and adapted for longitudinal movement one upon the other. While my improved locking devices can be applied to supports for any object intended to be raised or lowered, it is more particularly intended for garment-form supports.

I will now proceed to described my invention in detail, the novel features of which I will point out in the appended claims, reference being had to the accompanying drawing, forming part hereof, wherein Figure 1 is a side view of a garment-form having my improvement applied to the support therefor; Fig. 2 is a fragmentary longitudinal sectional view of my improved locking device; Figs. 3 and 4 are sectional plan views thereof, the sections being taken on lines 5--5 and 6 6, respectively, in Fig. 2.

In the drawing, 1 indicates a garment form of the usual variety mounted upon an adjustable support 2 carried by a stand 3, the said support consisting of a fixed post 4 secured, at one end thereof, to the stand 3, the other end. being slidably fitted in the slidable or adjustable supporting member 5.

Figs. 2, 3 and 4 illustrate a locking device consisting of a block 18, also secured in the upper end of the fixed post 4, the said block 18 being transversely recessed as at 19, and has an opening 20 in communication with the recess and also a slot 21. As shown in Fig. 2, the lower wall of the recess 19 is angularly disposed, as at 22, the upper rear wall being provided with a rounded depression 23 having a curved edge 24. rlhe onening 2O communicates with a longitudinal groove 25, in the rear wall of the recess 19, the said groove communicating with an opening 26 in the top of the block 18, the slot 21 communicating with the said opening 26. The slot 21, opening 26 and groove 25 are provided for the purpose of permitting the rod 27, which has a hooked end 28, to be inserted into the post 4 and block 18.

Within the recess 19 I loosely place a wedge-block 29, having a rounded bottom edge 30 and a rounded projection 31. The wedge-block 29 is provided with an opening 32a to receive the hook 28. The lower end of the rod 27 carries a spring 17 and is secured to the pedal 14. In the released position the rounded projection 31 of the block 29 will lie upon the rounded edge 32 in the depression 23 which will keep the edge 33 of the block 29 out of contact with the support-element 5; hence the support-element 5 can be moved up or down. As soon as the pedal is released, the spring will pull the rod 27 downwardly, causing the block 29 to move outwardly over the rounded edge 32 of the depression 31. As soon as the projection 31 has passed over the rounded edge 32, the curved bottom 30 of the block 29 will strike the angular wall 22, thereby causing the block 29 to rock and wedge or force the edge 33 of the block 29 against the support-element 5. While in this position the wedge-block 29 will firmly hold the support-element 5. Any tendency to move the element 5 downwardlv will wedge the block 29 more firmly. It will be seen that the block 18 fits the wall or bore of the support-element 5; hence the pressure will be brought upon the wall of the support throughout the greater part of its inner surface, as the elements of the stop vor lock will tend to spread as soon as their movable elements are forced downwardly.

For some forms of supports, the spring 17 can be dispensed with, as the weight of the support and object carried thereby will be sufficient to jam the wedge-blocks against the inner wall of the support-element.

Having now described my invention, what I claim and desire to secure by Letters Patent is:

1. In combination with a slidable tubular support, a fixed recessed block within the same provided with an inclined inner face on one side of the center of said support, a sliding and pivotally movable block in the recess of the fixed block having an inclined part for engaging said inclined part of the fixed block and a rod for raising and lowering said movable block, the latter being free to moveup and down when raised by said rod, but being tilted pivotally, transversely of said support by the said inclined faces when loWered far venough -"to effectY such Contact and consequently caused to bind against said fixed block and said support, locking the latter.

2. In combination With a slidable tubular support, a block Within the latter having a depression on one side of the center of said support, a movable block having near its upper end a rounded part for entering said depression, the support being free to move up and down when they `are in this position, and means li'or raising and lowering said movable block, the two blocks being also provided 'in their lower parts with faces, which When'brou'ght into contact by the ldescent'of saidmovable block, areadapted to tilt said movable blockinto engagementwith 'said support and with said Vfixed block'below said depression, thereby looking said support.A

'3. A locking devicefor slidably connected vtubularsupports consisting of a 'block fixed to a supporti and'having a recess intermediate ythe ends thereoilthe lower'w'all of said recess being angularly disposed,fthe upper portion yof therear WallY of therecess'being'provided with a depressionfhavingfa rounded fedge, a loosely mounted blockin said recess having a Ycurved'loWer end adapted to contact With the vangularlydisposed lower Wall of said Copies o1.v thisfpatent Ymay be attained `:for

recess, a rounded projection carried by said per enda rounded part `for entering said depression, the said support being free to move up and down when they are in this position, and means `for raising and lowering said movable block, vthe 'two blocks being `provided l'in ytheir lower parts with inclined faces arranged to beg brought into contact by the descent of said movable block, the inclined face of the latterbeing also slightly convex form, and such contact serving to tilt said blook'transversely of the support into locking engagement with said support and said iixed'block' below said depression.

Signed at New York city, N. Y., this 7th day oMarch, 1914.

'EDWARD LEVIN. Witnesses:

EDWARD A.. JARvis, `RUTH: MEYERS.

ve 'eentsfeacn'byeaddressxrgthe Commissioner of Patents,

Washington, D: C. I 

